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Finding the Fourth Proportional to 305.04, 421.12 and 201.68

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Solution

The fourth proportional to 305.04, 421.12 and 201.68 is: 278.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.04 : 421.12 = 201.68 : x
  2. Step 2: Convert to fraction form
    305.04/421.12 = 201.68/x
  3. Step 3: Cross multiply
    305.04x = 421.12 × 201.68
  4. Step 4: Simplify right side
    305.04x = 84,931.48
  5. Step 5: Solve for x
    x = 84,931.48/305.04
  6. Step 6: Final answer
    x = 278.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.